<template>
  <div id="app">
    <div>
      <span>全选:</span>
      <input type="checkbox" v-model="aa"/>
      <button @click="get">反选</button>
      <ul>
        <li v-for="(item) in arr" :key="item.name">
          <input type="checkbox" v-model="item.checked"/>
          <span>{{item.name}}</span>
        </li>
      </ul>
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      flag:false,
       arr: [
          {
            name: "猪八戒",
            checked: false,
          },
          {
            name: "孙悟空",
            checked: true,
          },
          {
            name: "唐僧",
            checked: false,
          },
          {
            name: "白龙马",
            checked: false,
          },
        ],
    }
  },
  methods: {
    get(){
      console.log(123)
      return this.arr.forEach(item=>item.checked = !item.checked)
    }
  },
  computed:{
    aa:{
      get(){
        return this.arr.every(item=>item.checked === true)
      },
      set(val){
        console.log(val)
        this.arr.forEach(item=>item.checked = val)
      }
    }
  }
}
</script>

<style>

</style>